Technical Articles

New Developments in Gear HobbingSeveral innovations have been introduced to the gear manufacturing industry in recent years. In the case of gear hobbing—the dry cutting technology and the ability to do it with powder-metallurgical HSS—might be two of the most impressive ones. And the technology is still moving forward. The aim of this article is to present recent developments in the field of gear hobbing in conjunction with the latest improvements regarding tool materials, process technology
and process integration.

High-Temperature Testing of Stanyl Plastic Gears: A Comparison with Tensile Fatigue DataThis paper shows an experimental study on the fatigue lifetime of high-heat polyamide (Stanyl) gears running in oil at 140°C. Based on previous works (Refs. 1–2), an analysis is made correcting for tooth bending and calculating actual root stresses. A comparison with tensile bar fatigue data for the same materials at 140°C shows that a good correlation exists between gear fatigue data and tensile bar fatigue data. This insight provides a solid basis for gear
designers to design plastic gears using actual material data.

Are We Going the Way of the Mayans and Romans (Other)A review of "A Nation on Borrowed Time," a book by Joe Arvin and Scott Newton about the decline of America's ability to create wealth through manufacturing, and its effect on the overall economy.